Photometering circuit

Details Photometering circuit Photometering circuit

1992-06-15

1994-03-01

Adams, Russell E.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250214L, G03B 708

Patent

active

052912388

ABSTRACT:
A photometering circuit comprises a photo-diode, an operational amplifier, a feedback diode and a latch releasing transistor. In a circuit utilizing a PNP transistor, for example, a cathode of the photo-diode is connected to a non-inverting input terminal of an operational amplifier and a reference potential, an anode of the photo-diode is connected to an inverting input terminal of the operational amplifier and an anode of the feedback diode, a cathode of the feedback diode is connected to an output terminal of the operational amplifier, a base of the PNP transistor is connected to the reference potential and a collector of the PNP transistor is connected to the inverting input terminal of the operational amplifier.

REFERENCES:
patent: 4076977 (1978-02-01), Tsunekawa et al.
patent: 4462670 (1984-07-01), Maida
patent: 4639134 (1987-01-01), Bletz

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